LXR linux/drivers/platform/x86/mxm-wmi.c

   1/*
   2 * MXM WMI driver
   3 *
   4 * Copyright(C) 2010 Red Hat.
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  This program is distributed in the hope that it will be useful,
  12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *  GNU General Public License for more details.
  15 *
  16 *  You should have received a copy of the GNU General Public License
  17 *  along with this program; if not, write to the Free Software
  18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20#include <linux/kernel.h>
  21#include <linux/module.h>
  22#include <linux/init.h>
  23#include <linux/mxm-wmi.h>
  24#include <linux/acpi.h>
  25
  26MODULE_AUTHOR("Dave Airlie");
  27MODULE_DESCRIPTION("MXM WMI Driver");
  28MODULE_LICENSE("GPL");
  29
  30#define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
  31
  32MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
  33
  34#define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
  35#define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
  36
  37struct mxds_args {
  38        u32 func;
  39        u32 args;
  40        u32 xarg;
  41};
  42
  43int mxm_wmi_call_mxds(int adapter)
  44{
  45        struct mxds_args args = {
  46                .func = MXM_WMMX_FUNC_MXDS,
  47                .args = 0,
  48                .xarg = 1,
  49        };
  50        struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  51        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  52        acpi_status status;
  53
  54        printk("calling mux switch %d\n", adapter);
  55
  56        status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
  57                                     &output);
  58
  59        if (ACPI_FAILURE(status))
  60                return status;
  61
  62        printk("mux switched %d\n", status);
  63        return 0;
  64                            
  65}
  66EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
  67
  68int mxm_wmi_call_mxmx(int adapter)
  69{
  70        struct mxds_args args = {
  71                .func = MXM_WMMX_FUNC_MXMX,
  72                .args = 0,
  73                .xarg = 1,
  74        };
  75        struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  76        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  77        acpi_status status;
  78
  79        printk("calling mux switch %d\n", adapter);
  80
  81        status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
  82                                     &output);
  83
  84        if (ACPI_FAILURE(status))
  85                return status;
  86
  87        printk("mux mutex set switched %d\n", status);
  88        return 0;
  89                            
  90}
  91EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
  92
  93bool mxm_wmi_supported(void)
  94{
  95        bool guid_valid;
  96        guid_valid = wmi_has_guid(MXM_WMMX_GUID);
  97        return guid_valid;
  98}
  99EXPORT_SYMBOL_GPL(mxm_wmi_supported);
 100
 101static int __init mxm_wmi_init(void)
 102{
 103        return 0;
 104}
 105
 106static void __exit mxm_wmi_exit(void)
 107{
 108}
 109
 110module_init(mxm_wmi_init);
 111module_exit(mxm_wmi_exit);
 112